assessment of ils protection areas impact on large aircraft operations methodology enac
TRANSCRIPT
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Assessment of ILS protection areas impact on large aircraft
operationsMethodology
ENAC
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• Selection of test points to be tested during real ground and flight measurements with an A380 aircraft
• Simulate these points with various modeling tools :– To reduce the number of points to be
measured to the most significant ones– To get some pre-measurement predictions in
order to evaluate the prediction performances of the tools
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• Analyze the measurements and evaluate the impact of the A380 on the size of the critical and sensitive areas
• Compare the measurements with the predictions of the modeling tools and evaluate the correlation between simulations and measurements.
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ILS simulation methodology• Simulation of the radiation patterns
delivered by the ILS
• Choose a method to simulate the propagation of electromagnetic waves and scattering on obstacles:
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– Method of Moments– Multilevel Fast Multipole Method– Physical Optics– Improved Physical Optics– Geometrical Optics Geometrical theory of
diffraction– Parabolic Equation– Etc…
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• Design a model of the object to evaluate (A380) that fits with the simulation method and represents the most critical parts involved in the scattering of electromagnetic waves
• Simulate the radiation pattern of the receiver’s antenna
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• Simulate the receiver signal processing
• Simulate the measurement path and receiver speed
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ILS simulation tools• AXIS from NANCO, Oslo
DOS program based on Physical Optics
• ATOLL from ENAC, ToulouseWindows program based on Physical Optics
• NPPM from OHIO UniversityWindows program based on Physical Optics
• IHSS 3D modeling from NAVCOM Consult
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ILS radiation patterns• Toulouse Blagnac 14R
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LLZ25L Antenna Diagram
-100
-95
-90
-85
-80
-75
-70
-65
-60
-55
-50
-45
-40
-35
-30
-25
-20
-15
-10
-5
0
051015202530354045505560657075808590Horizontel Angle in Degree
RF
in d
B
CSB
SBO
CL_CSB
CL_SBO
10.04.2006 Flgh. Frankfurt/Main
10,6 dB
• Frankfurt 25L
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A380 model• Most realistic model
Used for calculations with the Method of Moments
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A380 model• Simplified models used in the simulation
tools based on Physical Optics– NPPM model
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• Predominant impact of tailfin
A380 model
CSB Surface Currents SBO Surface Currents
Calculated with EMC2000 from EADS using the Method of Moments
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• Simplified models used in the simulation tools based on Physical Optics– ATOLL and
AXIS model
A380 model
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Radiation pattern of receiving measurements Antennas
ATOLL simulations
DFS antenna DSNA antenna
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Receiver modeling• Receiver impact on measurements
P11 bis at Toulouse airport (Forward = 2886, sideway = 178, rotation = -30°)R&S EVS200 + DSNA antenna
ARTUS 324 + 45° turned dipole antenna
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Receiver modeling• Receiver and speed impact on measurements
P11 bis at Toulouse airport (Forward = 2886, sideway = 178, rotation = -30°)
Measurement at 40 km/h
Measurement at 13 km/h
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Lab measurements on some receivers and associated
ATOLL models• Test setting
ILS receiver
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1Hz 2Hz 3Hz 4Hz 5Hz 6Hz 7Hz 8Hz 9Hz 10Hz 11Hz 12Hz 13Hz 14Hz NA
•AGC cut-off frequency: 9Hz•AGC filter order: 4
Model parameters:•LF band pass filters: 21Hz•LF band pass filter order: 5•LF detection filter cut-off frequency: 8Hz•LF detection filter order: 2
R&S EVS 300
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MMR Thales
1Hz 2Hz 3Hz 4Hz 5Hz 6Hz 7Hz 8Hz 9Hz 10Hz 11Hz 12Hz 13Hz 14Hz NA
•AGC cut-off frequency: 10Hz•AGC filter order: 4
Model parameters:•LF band pass filters: 4Hz•LF band pass filter order: 2•LF detection filter cut-off frequency: 3Hz•LF detection filter order: 2
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MMR Collins
1Hz 2Hz 3Hz 4Hz 5Hz 6Hz 7Hz 8Hz 9Hz 10Hz 11Hz 12Hz 13Hz 14Hz NA
•AGC cut-off frequency: 3Hz•AGC filter order: 3
Model parameters:•LF band pass filters: 10Hz•LF band pass filter order: 3•LF detection filter cut-off frequency: 6Hz•LF detection filter order: 2
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Some results
P6: TailForward = 1579m, sideway = 57m, rotation = 90°
ATOLL simulation and measurements with DSNA receiver antenna (orange = raw data) and EVS200
Disturbance amplitude:
Disturbance amplitude with A380: T1 = 27 µA, T2 = -31µADisturbance amplitude without A380 at same points: T1=-1µA, T2=-1µA
Disturbance amplitude with A380 only: T1 = 28µA, T2 = -30 µA
T1 = 26µA, T2 = -29µA
T1 = 28µA, T2 = -30µA
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Some results
P6: TailForward = 1579m, sideway = 57m, rotation = 90°
AXIS simulation with omnidirectionnal antenna.
Measurements with DSNA receiver antenna and EVS200
Disturbance amplitude:
Disturbance amplitude with A380: T1 = 27 µA, T2 = -31µADisturbance amplitude without A380 at same points: T1=-1µA, T2=-1µA
Disturbance amplitude with A380 only: T1 = 28µA, T2 = -30 µA
T1 = 35µA, T2 = -40µA
T1 = 28µA, T2 = -30µA
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Some results
P6: TailForward = 1579m, sideway = 57m, rotation = 90°
NPPM simulation with omnidirectionnal antenna.
Measurements with DSNA receiver antenna and EVS200
Disturbance amplitude:
Disturbance amplitude with A380: T1 = 27 µA, T2 = -31µADisturbance amplitude without A380 at same points: T1=-1µA, T2=-1µA
Disturbance amplitude with A380 only: T1 = 28µA, T2 = -30 µA
T1 = 36µA, T2 = -38µA
T1 = 28µA, T2 = -30µA
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Some results
P6 bis: TailForward = 1579m, sideway = 83m, rotation = 90°
IHSS simulation with DFS antenna.
Measurements with DSNA receiver antenna and EVS200
Disturbance amplitude: T1 = 17µA, T2 = -18µA
Disturbance amplitude with A380: T1 = 17 µA, T2 = -20µADisturbance amplitude without A380 at same points: T1=-1µA, T2=-1µA
Disturbance amplitude with A380 only: T1 = 18µA, T2 = -19 µA T1 = 18µA, T2 = -19µA
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Some resultsP11 bis at 40 km/h : TailForward = 2886m, sideway = 178m, rotation = -30°
ATOLL simulation and measurements with DSNA receiver antenna (orange = raw data) and EVS200
Disturbance amplitude:
Disturbance amplitude with A380: T1 = +6 µA, T2 = +2µADisturbance amplitude without A380 at same points: T1=-1µA, T2= 0µA
Disturbance amplitude with A380 only: T1 = 28µA, T2 = -30 µA
T1 = +8µA, T2 = +4µA
T1 = +7µA, T2 = +2µA
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Some results
P11 bis at 40 km/h : TailForward = 2886m, sideway = 178m, rotation = -30°
AXIS simulation with omnidirectionnal antenna
Measurements with DSNA receiver antenna and EVS200
Disturbance amplitude:
Disturbance amplitude with A380: T1 = +6 µA, T2 = +2µADisturbance amplitude without A380 at same points: T1=-1µA, T2= 0µA
Disturbance amplitude with A380 only: T1 = 28µA, T2 = -30 µA
T1 = +5µA, T2 = +4µA
T1 = +7µA, T2 = +2µA
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Some results
P11 bis at 40 km/h : TailForward = 2886m, sideway = 178m, rotation = -30°
NPPM simulation with omnidirectionnal antenna
Measurements with DSNA receiver antenna EVS200
Disturbance amplitude:
Disturbance amplitude with A380: T1 = +6 µA, T2 = +2µADisturbance amplitude without A380 at same points: T1=-1µA, T2= 0µA
Disturbance amplitude with A380 only: T1 = 28µA, T2 = -30 µA
T1 = +3.5µA, T2 = +3µA
T1 = +7µA, T2 = +2µA
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Some results
P11 bis at 13 km/h:TailForward = 2886m, sideway = 178m, rotation = -30°
ATOLL simulation and measurements with DSNA receiver antenna (orange = raw data) and EVS200
Disturbance amplitude:
Disturbance amplitude with A380: T1 = +1 µA, T2 = +2µADisturbance amplitude without A380 at same points: T1= 0µA, T2= 0µA
Disturbance amplitude with A380 only: T1 = 28µA, T2 = -30 µA
T1 = +3.5µA, T2 = +4µA
T1 = +1µA, T2 = +2µA
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Some results
P11 bis at 13 km/h: TailForward = 2886m, sideway = 178m, rotation = -30°
AXIS simulation with omnidirectionnal antenna
Measurements with DSNA receiver antenna and EVS200
Disturbance amplitude:
Disturbance amplitude with A380: T1 = +1 µA, T2 = +2µADisturbance amplitude without A380 at same points: T1= 0µA, T2= 0µA
Disturbance amplitude with A380 only: T1 = 28µA, T2 = -30 µA
T1 = +5µA, T2 = +4µA
T1 = +1µA, T2 = +2µA
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Some results
P11 bis at 13 km/h: TailForward = 2886m, sideway = 178m, rotation = -30°
NPPM simulation with omnidirectionnal antenna
Measurements with DSNA receiver antenna and EVS200
Disturbance amplitude:
Disturbance amplitude with A380: T1 = +1 µA, T2 = +2µADisturbance amplitude without A380 at same points: T1= 0µA, T2= 0µA
Disturbance amplitude with A380 only: T1 = 28µA, T2 = -30 µA
T1 = +3µA, T2 = +3µA
T1 = +1µA, T2 = +2µA